Question

40 баллов даю 1 и 2.

Answer 1

$2) - 5 \times \frac{3}{10} b = - \frac{5 \times 3}{10}b = - \frac{3}{2} b$
$4) - 8c \times ( - \frac{3}{4}d) = \frac{8c \times 3}{4}d = 6cd$